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Java Developer Interview Questions

In your interview for a java developer position, be prepared to answer technical questions that test your understanding of Java basics. Interviewers may also ask open-ended questions to assess your coding and problem-solving abilities. Prepare for non-technical questions that focus on time management, interpersonal communication, and work ethic.

Top Java Developer Interview Questions & How to Answer

Question 1

Question #1: What is the difference between HashTable and HashMap in Java?

How to answer
How to answer: Interviewers use technical questions to assess your formal training and understanding of the Java programming language. Use your answer to demonstrate your communication skills. Even if you have been coding for some time, it can be helpful to review Java basics before your interview.
Question 2

Question #2: Write a program to determine if 243 is an Armstrong number.

How to answer
How to answer: Interviewers use open-ended questions to test your coding skills. This question allows the employer to assess your ability to solve a problem using a Java algorithm. Explain your thinking process as you use a code editor or whiteboard to solve the problem.
Question 3

Question #3: How do you produce quality code when you have several Java projects to complete at once?

How to answer
How to answer: Java developers often juggle multiple projects at the same time. Interviewers use questions such as this to test your time management and organizational skills. Employers are also trying to assess your commitment to quality work. If you have experience as a developer, include examples from your work history that demonstrate high-quality work and effective time management.

30,862 java developer interview questions shared by candidates

1) Hackerearth online test. -> 3 MCQs on java, 2 problem solving 2) Telephonic round 1- > Very basic java question like, when linkedlist, when to use arraylist, immutable class, singleton class, executor framework etc. Just theoretical question. Seems any fresher was taking interview. I had to ask if he has my profile and knows for which position the interview is being taken in between the interview. I have to call HR as the interviewer didn't call me on scheduled time. Was late by 30 minutes and got call after multiple HR chase-up 3) Telephonic round 2->I declined to give as didn't get a call from panel during scheduled one hour time. Before interview HR told similar questions will be there as round 1. I asked her why so simple/basic questions for 8 year exp person, she told its good thing as you can clear easily.
avatar

Senior Java Developer

Interviewed at Wissen Infotech

3.8★
Jun 11, 2020

1) Hackerearth online test. -> 3 MCQs on java, 2 problem solving 2) Telephonic round 1- > Very basic java question like, when linkedlist, when to use arraylist, immutable class, singleton class, executor framework etc. Just theoretical question. Seems any fresher was taking interview. I had to ask if he has my profile and knows for which position the interview is being taken in between the interview. I have to call HR as the interviewer didn't call me on scheduled time. Was late by 30 minutes and got call after multiple HR chase-up 3) Telephonic round 2->I declined to give as didn't get a call from panel during scheduled one hour time. Before interview HR told similar questions will be there as round 1. I asked her why so simple/basic questions for 8 year exp person, she told its good thing as you can clear easily.

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Glassdoor has 30,862 interview questions and reports from Java developer interviews. Prepare for your interview. Get hired. Love your job.